it is kind of strange, that you ask in chinese, but this is baidu, so we all understand it in one way or the other.
i can only give answer to first question:
anything between 5000 and 400000 words.
small encyclopedia had 45000 words. My large Webster encyclopedia has quarter million words?and Collins concise dictionary has 324 thousand words.
both are from the USA, but contain also real english, not only American english.
這是壹種奇怪的，妳問中國人，但是這是百度，所以大家都明白它以某種方式或其他。
我只能給回答第壹個問題：
5000和40萬字之間的任何東西。
小百科有45000字。我的大百科全書韋伯斯特有四分之壹萬字
柯林斯簡明詞典有324000字。
無論是來自美國，但也含有地道英語，不僅美國英語。
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